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list.js
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list.js
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/**
* Contains helpers for safely splitting lists of CSS values,
* preserving parentheses and quotes.
*
* @example
* const list = postcss.list
*
* @namespace list
*/
let list = {
split (string, separators, last) {
let array = []
let current = ''
let split = false
let func = 0
let quote = false
let escape = false
for (let letter of string) {
if (quote) {
if (escape) {
escape = false
} else if (letter === '\\') {
escape = true
} else if (letter === quote) {
quote = false
}
} else if (letter === '"' || letter === '\'') {
quote = letter
} else if (letter === '(') {
func += 1
} else if (letter === ')') {
if (func > 0) func -= 1
} else if (func === 0) {
if (separators.includes(letter)) split = true
}
if (split) {
if (current !== '') array.push(current.trim())
current = ''
split = false
} else {
current += letter
}
}
if (last || current !== '') array.push(current.trim())
return array
},
/**
* Safely splits space-separated values (such as those for `background`,
* `border-radius`, and other shorthand properties).
*
* @param {string} string Space-separated values.
*
* @return {string[]} Split values.
*
* @example
* postcss.list.space('1px calc(10% + 1px)') //=> ['1px', 'calc(10% + 1px)']
*/
space (string) {
let spaces = [' ', '\n', '\t']
return list.split(string, spaces)
},
/**
* Safely splits comma-separated values (such as those for `transition-*`
* and `background` properties).
*
* @param {string} string Comma-separated values.
*
* @return {string[]} Split values.
*
* @example
* postcss.list.comma('black, linear-gradient(white, black)')
* //=> ['black', 'linear-gradient(white, black)']
*/
comma (string) {
return list.split(string, [','], true)
}
}
module.exports = list